symbols of sets Flashcards
1
Q
empty/null set
A
{ } or O with a /
2
Q
subset
A
flat C with either a line or no line
3
Q
universal set
A
ξ
4
Q
element of
A
rounded E
5
Q
not an element of
A
rounded E with a /
6
Q
set
A
{ }
7
Q
number of elements in a set (set A in this case)
A
n(A)
8
Q
number of elements in a set (complement of set A in this case)
A
n(A’)
9
Q
intersection of sets
A
n (bigger)
10
Q
union of sets
A
u (bigger)
